PURPOSE: To make the size of a toner injection port as large as possible, to improve the production efficiency of a toner cartridge and to easily seal the toner injection port.

CONSTITUTION: A toner container 2 having a peripheral wall 10 whose one end is opened, and a closing member 3 closing the opening of one end of the peripheral wall 10 are provided. A holding groove 15 is formed on the inner surface of a holding groove forming part 12 which is provided along the periphery of the opening and whose one end is opened. At least either the member 3 or the groove 15 is elastically deformed. The periphery of the member 3 is press-fitted in the groove 15. The opening is the toner injection port 4.